491847771 has 16 divisors (see below), whose sum is σ = 677270048. Its totient is φ = 317260800.

The previous prime is 491847751. The next prime is 491847779. The reversal of 491847771 is 177748194.

It is a happy number.

It is not a de Polignac number, because 491847771 - 2²¹ = 489750619 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 491847771.

It is not an unprimeable number, because it can be changed into a prime (491847779) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7851 + ... + 32331.

It is an arithmetic number, because the mean of its divisors is an integer number (42329378).

Almost surely, 2^491847771 is an apocalyptic number.

491847771 is a deficient number, since it is larger than the sum of its proper divisors (185422277).

491847771 is a wasteful number, since it uses less digits than its factorization.

491847771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24702.

The product of its digits is 395136, while the sum is 48.

The square root of 491847771 is about 22177.6412406730. The cubic root of 491847771 is about 789.3632485905.

The spelling of 491847771 in words is "four hundred ninety-one million, eight hundred forty-seven thousand, seven hundred seventy-one".